التحقق من المدخلات مقابل قواعد العمل

في هذا الدرس

put each kind of rule in the right place.

الموضوعات المخطط لها

• Input validation: shape and range of data, checkable from the request alone (not blank, positive, format).
• Business rules: depend on state or domain knowledge (stock is sufficient, SKU is unique, order is not shipped).
• Input rules go on the DTO at the edge; business rules go in the service or domain.
• Create and update often need different rules: use separate DTOs (or validation groups).